This is probably one of the biggest games because, coming off the bye week and that Northwestern game, you know, we've got to have good preparation, be focused and make sure our fundamentals are all together.

Miller showed all of those qualities in his first action back from injury, piling up 281 total yards and four passing touchdowns (and no turnovers) against Wisconsin in Week 5.

Against Northwestern the following week, Miller struggled, completing less than 60 percent of his passes for the first time this year while looking tentative in the run game. That tentativeness was caused by the lingering pain from his knee injury.

"I wasn't fully myself," Miller said of the Northwestern game, via the Eleven Warriors video. "I just gotta keep getting healthy, getting treatment on [the injured knee] and get back to my old ways."

Miller admitted that he's not 100 percent healthy yet, according to Marcus Hartman of Fox Sports Ohio, but the junior quarterback has been working hard to correct the mistakes he made against Northwestern.

How has Miller been doing that?

For starters, Meyer has Miller focusing on ball security. Miller fumbled twice against Northwestern—the first of which resulted in a Northwestern touchdown, while the second occurred as Miller was barreling his way toward the end zone inside the Wildcats' five-yard line.

Jonathan Daniel/Getty Images

Both were huge mistakes that likely would have cost Ohio State the game, if not for Carlos Hyde's heroics.

To prevent Miller from making the same mistakes, Meyer has his quarterback holding the ball properly every chance he can—even as the team goes through its stretching routine.

“I wasn’t really holding the ball correctly when I was cutting through the holes and I wasn’t holding the ball tight,” Miller said, according to Ari Wasserman of The Plain Dealer. “It’s an easy fix."